1645158857 has 2 divisors, whose sum is σ = 1645158858. Its totient is φ = 1645158856.

The previous prime is 1645158847. The next prime is 1645158877. The reversal of 1645158857 is 7588515461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861774736 + 783384121 = 29356^2 + 27989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645158857 - 2⁶ = 1645158793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645158817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822579428 + 822579429.

It is an arithmetic number, because the mean of its divisors is an integer number (822579429).

Almost surely, 2^1645158857 is an apocalyptic number.

It is an amenable number.

1645158857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645158857 is an equidigital number, since it uses as much as digits as its factorization.

1645158857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344000, while the sum is 50.

The square root of 1645158857 is about 40560.5578980369. The cubic root of 1645158857 is about 1180.5089389881.

The spelling of 1645158857 in words is "one billion, six hundred forty-five million, one hundred fifty-eight thousand, eight hundred fifty-seven".